[PATCH 0/3] i2c-mpc: add support for the Freescale MPC512x and other fixes

[PATCH 0/3] i2c-mpc: add support for the Freescale MPC512x and other fixes

[Wolfgang Grandegger]

This patch series adds support for the MPC512x from Freescale to the
i2c-mpc driver. At that occasion, issues with  __devinit[data] have
been fixed and the doc of the FSL I2C dts bindings updated. It has
been tested on a MPC5121ADS, TQM5200 and TQM8560 board

Wolfgang

Wolfgang Grandegger (3):
  i2c-mpc: use __devinit[data] for initialization functions and data
  i2c-mpc: add support for the MPC512x processors from Freescale
  powerpc: doc/dts-bindings: update doc of FSL I2C bindings

 Documentation/powerpc/dts-bindings/fsl/i2c.txt |   10 +-
 drivers/i2c/busses/Kconfig                     |    9 +-
 drivers/i2c/busses/i2c-mpc.c                   |  185 +++++++++++++++---------
 3 files changed, 126 insertions(+), 78 deletions(-)

[PATCH 1/3] i2c-mpc: use __devinit[data] for initialization functions and data

[Wolfgang Grandegger]

From: Wolfgang Grandegger <wg@denx.de>

"__devinit[data]" has not yet been used for all initialization functions
and data. To avoid truncating lines, the struct mpc_i2c_match_data has
been renamed to mpc_i2c_data, which is even the better name.

Signed-off-by: Wolfgang Grandegger <wg@denx.de>
---
 drivers/i2c/busses/i2c-mpc.c |   99 +++++++++++++++++++----------------------
 1 files changed, 46 insertions(+), 53 deletions(-)

diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index f627001..2cb864e 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -66,7 +66,7 @@ struct mpc_i2c_divider {
 	u16 fdr;	/* including dfsrr */
 };
 
-struct mpc_i2c_match_data {
+struct mpc_i2c_data {
 	void (*setclock)(struct device_node *node,
 			 struct mpc_i2c *i2c,
 			 u32 clock, u32 prescaler);
@@ -165,7 +165,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
 }
 
 #ifdef CONFIG_PPC_MPC52xx
-static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
+static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
 	{20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
 	{28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
 	{36, 0x26}, {40, 0x27}, {44, 0x04}, {48, 0x28},
@@ -186,7 +186,8 @@ static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
 	{10240, 0x9d}, {12288, 0x9e}, {15360, 0x9f}
 };
 
-int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
+static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
+					  int prescaler)
 {
 	const struct mpc_i2c_divider *div = NULL;
 	unsigned int pvr = mfspr(SPRN_PVR);
@@ -215,9 +216,9 @@ int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
 	return div ? (int)div->fdr : -EINVAL;
 }
 
-static void mpc_i2c_setclock_52xx(struct device_node *node,
-				  struct mpc_i2c *i2c,
-				  u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
+					    struct mpc_i2c *i2c,
+					    u32 clock, u32 prescaler)
 {
 	int ret, fdr;
 
@@ -230,15 +231,15 @@ static void mpc_i2c_setclock_52xx(struct device_node *node,
 		dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
 }
 #else /* !CONFIG_PPC_MPC52xx */
-static void mpc_i2c_setclock_52xx(struct device_node *node,
-				  struct mpc_i2c *i2c,
-				  u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
+					    struct mpc_i2c *i2c,
+					    u32 clock, u32 prescaler)
 {
 }
 #endif /* CONFIG_PPC_MPC52xx*/
 
 #ifdef CONFIG_FSL_SOC
-static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
+static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
 	{160, 0x0120}, {192, 0x0121}, {224, 0x0122}, {256, 0x0123},
 	{288, 0x0100}, {320, 0x0101}, {352, 0x0601}, {384, 0x0102},
 	{416, 0x0602}, {448, 0x0126}, {480, 0x0103}, {512, 0x0127},
@@ -258,7 +259,7 @@ static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
 	{49152, 0x011e}, {61440, 0x011f}
 };
 
-u32 mpc_i2c_get_sec_cfg_8xxx(void)
+static u32 __devinit mpc_i2c_get_sec_cfg_8xxx(void)
 {
 	struct device_node *node = NULL;
 	u32 __iomem *reg;
@@ -287,7 +288,8 @@ u32 mpc_i2c_get_sec_cfg_8xxx(void)
 	return val;
 }
 
-int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, u32 prescaler)
+static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
+					  u32 prescaler)
 {
 	const struct mpc_i2c_divider *div = NULL;
 	u32 divider;
@@ -320,9 +322,9 @@ int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, u32 prescaler)
 	return div ? (int)div->fdr : -EINVAL;
 }
 
-static void mpc_i2c_setclock_8xxx(struct device_node *node,
-				  struct mpc_i2c *i2c,
-				  u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
+					    struct mpc_i2c *i2c,
+					    u32 clock, u32 prescaler)
 {
 	int ret, fdr;
 
@@ -338,9 +340,9 @@ static void mpc_i2c_setclock_8xxx(struct device_node *node,
 }
 
 #else /* !CONFIG_FSL_SOC */
-static void mpc_i2c_setclock_8xxx(struct device_node *node,
-				  struct mpc_i2c *i2c,
-				  u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
+					    struct mpc_i2c *i2c,
+					    u32 clock, u32 prescaler)
 {
 }
 #endif /* CONFIG_FSL_SOC */
@@ -529,8 +531,8 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
 			clock = *prop;
 
 		if (match->data) {
-			struct mpc_i2c_match_data *data =
-				(struct mpc_i2c_match_data *)match->data;
+			struct mpc_i2c_data *data =
+				(struct mpc_i2c_data *)match->data;
 			data->setclock(op->node, i2c, clock, data->prescaler);
 		} else {
 			/* Backwards compatibility */
@@ -582,44 +584,35 @@ static int __devexit fsl_i2c_remove(struct of_device *op)
 	return 0;
 };
 
+static struct mpc_i2c_data __devinitdata mpc_i2c_data_52xx = {
+	.setclock = mpc_i2c_setclock_52xx,
+};
+
+static struct mpc_i2c_data __devinitdata mpc_i2c_data_8313 = {
+	.setclock = mpc_i2c_setclock_8xxx,
+};
+
+static struct mpc_i2c_data __devinitdata mpc_i2c_data_8543 = {
+	.setclock = mpc_i2c_setclock_8xxx,
+	.prescaler = 2,
+};
+
+static struct mpc_i2c_data __devinitdata mpc_i2c_data_8544 = {
+	.setclock = mpc_i2c_setclock_8xxx,
+	.prescaler = 3,
+};
+
 static const struct of_device_id mpc_i2c_of_match[] = {
-	{.compatible = "mpc5200-i2c",
-	 .data = &(struct mpc_i2c_match_data) {
-			.setclock = mpc_i2c_setclock_52xx,
-		},
-	},
-	{.compatible = "fsl,mpc5200b-i2c",
-	 .data = &(struct mpc_i2c_match_data) {
-			.setclock = mpc_i2c_setclock_52xx,
-		},
-	},
-	{.compatible = "fsl,mpc5200-i2c",
-	 .data = &(struct mpc_i2c_match_data) {
-			.setclock = mpc_i2c_setclock_52xx,
-		},
-	},
-	{.compatible = "fsl,mpc8313-i2c",
-	 .data = &(struct mpc_i2c_match_data) {
-			.setclock = mpc_i2c_setclock_8xxx,
-		},
-	},
-	{.compatible = "fsl,mpc8543-i2c",
-	 .data = &(struct mpc_i2c_match_data) {
-			.setclock = mpc_i2c_setclock_8xxx,
-			.prescaler = 2,
-		},
-	},
-	{.compatible = "fsl,mpc8544-i2c",
-	 .data = &(struct mpc_i2c_match_data) {
-			.setclock = mpc_i2c_setclock_8xxx,
-			.prescaler = 3,
-		},
+	{.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
+	{.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, },
+	{.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
+	{.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, },
+	{.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, },
+	{.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, },
 	/* Backward compatibility */
-	},
 	{.compatible = "fsl-i2c", },
 	{},
 };
-
 MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
 
 
-- 
1.6.2.5

[PATCH 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

[Wolfgang Grandegger]

From: Wolfgang Grandegger <wg@denx.de>

The "setclock" initialization functions have been renamed to "setup"
because I2C interrupts must be enabled for the MPC512x. This requires
to handle "fsl,preserve-clocking" in a slighly different way. Also,
the old settings are now reported calling dev_dbg(). For the MPC512x
the clock setup function of the MPC52xx can be re-used.

Signed-off-by: Wolfgang Grandegger <wg@denx.de>
---
 drivers/i2c/busses/Kconfig   |    9 ++--
 drivers/i2c/busses/i2c-mpc.c |  122 ++++++++++++++++++++++++++++++------------
 2 files changed, 93 insertions(+), 38 deletions(-)

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 5f318ce..f481f30 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -418,13 +418,14 @@ config I2C_IXP2000
 	  instead.
 
 config I2C_MPC
-	tristate "MPC107/824x/85xx/52xx/86xx"
+	tristate "MPC107/824x/85xx/512x/52xx/86xx"
 	depends on PPC32
 	help
 	  If you say yes to this option, support will be included for the
-	  built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245 and
-	  MPC85xx/MPC8641 family processors. The driver may also work on 52xx
-	  family processors, though interrupts are known not to work.
+	  built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245,
+	  MPC85xx/MPC8641 and MPC512x family processors. The driver may
+	  also work on 52xx family processors, though interrupts are known
+	  not to work.
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-mpc.
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index 2cb864e..70c3e5d 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -67,9 +67,8 @@ struct mpc_i2c_divider {
 };
 
 struct mpc_i2c_data {
-	void (*setclock)(struct device_node *node,
-			 struct mpc_i2c *i2c,
-			 u32 clock, u32 prescaler);
+	void (*setup)(struct device_node *node, struct mpc_i2c *i2c,
+		      u32 clock, u32 prescaler);
 	u32 prescaler;
 };
 
@@ -164,7 +163,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
 	return 0;
 }
 
-#ifdef CONFIG_PPC_MPC52xx
+#if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x)
 static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
 	{20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
 	{28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
@@ -216,12 +215,18 @@ static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
 	return div ? (int)div->fdr : -EINVAL;
 }
 
-static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
-					    struct mpc_i2c *i2c,
-					    u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
 {
 	int ret, fdr;
 
+	if (clock == -1) {
+		dev_dbg(i2c->dev, "using fdr %d\n",
+			readb(i2c->base + MPC_I2C_FDR));
+		return;	/* preserve clocking */
+	}
+
 	ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
 	fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
 
@@ -230,13 +235,50 @@ static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
 	if (ret >= 0)
 		dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
 }
-#else /* !CONFIG_PPC_MPC52xx */
-static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
-					    struct mpc_i2c *i2c,
-					    u32 clock, u32 prescaler)
+#else /* !(CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x) */
+static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
+{
+}
+#endif /* CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x */
+
+#ifdef CONFIG_PPC_MPC512x
+static void __devinit mpc_i2c_setup_512x(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
+{
+	struct device_node *node_ctrl;
+	void __iomem *ctrl;
+	const u32 *pval;
+	u32 idx;
+
+	/* Enable I2C interrupts for mpc5121 */
+	node_ctrl = of_find_compatible_node(NULL, NULL,
+					    "fsl,mpc5121-i2c-ctrl");
+	if (node_ctrl) {
+		ctrl = of_iomap(node_ctrl, 0);
+		if (ctrl) {
+
+			/* Interrupt enable bits for i2c-0/1/2: bit 24/26/28 */
+			pval = of_get_property(node, "reg", NULL);
+			idx = (*pval & 0xff) / 0x20;
+			setbits32(ctrl, 1 << (24 + idx * 2));
+			iounmap(ctrl);
+		}
+		of_node_put(node_ctrl);
+	}
+
+	/* The clock setup for the 52xx works also fine for the 512x */
+	mpc_i2c_setup_52xx(node, i2c, clock, prescaler);
+}
+#else /* CONFIG_PPC_MPC512x */
+static void __devinit mpc_i2c_setup_512x(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
 {
 }
-#endif /* CONFIG_PPC_MPC52xx*/
+#endif /* CONFIG_PPC_MPC512x */
 
 #ifdef CONFIG_FSL_SOC
 static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
@@ -322,12 +364,19 @@ static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
 	return div ? (int)div->fdr : -EINVAL;
 }
 
-static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
-					    struct mpc_i2c *i2c,
-					    u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
 {
 	int ret, fdr;
 
+	if (clock == -1) {
+		dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n",
+			readb(i2c->base + MPC_I2C_DFSRR),
+			readb(i2c->base + MPC_I2C_FDR));
+		return;	/* preserve clocking */
+	}
+
 	ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
 	fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
 
@@ -340,9 +389,9 @@ static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
 }
 
 #else /* !CONFIG_FSL_SOC */
-static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
-					    struct mpc_i2c *i2c,
-					    u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
+					 struct mpc_i2c *i2c,
+					 u32 clock, u32 prescaler)
 {
 }
 #endif /* CONFIG_FSL_SOC */
@@ -525,21 +574,21 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
 		}
 	}
 
-	if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
+	if (of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
+		clock = -1;
+	} else {
 		prop = of_get_property(op->node, "clock-frequency", &plen);
 		if (prop && plen == sizeof(u32))
 			clock = *prop;
+	}
 
-		if (match->data) {
-			struct mpc_i2c_data *data =
-				(struct mpc_i2c_data *)match->data;
-			data->setclock(op->node, i2c, clock, data->prescaler);
-		} else {
-			/* Backwards compatibility */
-			if (of_get_property(op->node, "dfsrr", NULL))
-				mpc_i2c_setclock_8xxx(op->node, i2c,
-						      clock, 0);
-		}
+	if (match->data) {
+		struct mpc_i2c_data *data = (struct mpc_i2c_data *)match->data;
+		data->setup(op->node, i2c, clock, data->prescaler);
+	} else {
+		/* Backwards compatibility */
+		if (of_get_property(op->node, "dfsrr", NULL))
+			mpc_i2c_setup_8xxx(op->node, i2c, clock, 0);
 	}
 
 	dev_set_drvdata(&op->dev, i2c);
@@ -585,20 +634,24 @@ static int __devexit fsl_i2c_remove(struct of_device *op)
 };
 
 static struct mpc_i2c_data __devinitdata mpc_i2c_data_52xx = {
-	.setclock = mpc_i2c_setclock_52xx,
+	.setup = mpc_i2c_setup_52xx,
+};
+
+static struct mpc_i2c_data __devinitdata mpc_i2c_data_512x = {
+	.setup = mpc_i2c_setup_512x,
 };
 
 static struct mpc_i2c_data __devinitdata mpc_i2c_data_8313 = {
-	.setclock = mpc_i2c_setclock_8xxx,
+	.setup = mpc_i2c_setup_8xxx,
 };
 
 static struct mpc_i2c_data __devinitdata mpc_i2c_data_8543 = {
-	.setclock = mpc_i2c_setclock_8xxx,
+	.setup = mpc_i2c_setup_8xxx,
 	.prescaler = 2,
 };
 
 static struct mpc_i2c_data __devinitdata mpc_i2c_data_8544 = {
-	.setclock = mpc_i2c_setclock_8xxx,
+	.setup = mpc_i2c_setup_8xxx,
 	.prescaler = 3,
 };
 
@@ -606,6 +659,7 @@ static const struct of_device_id mpc_i2c_of_match[] = {
 	{.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
 	{.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, },
 	{.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
+	{.compatible = "fsl,mpc5121-i2c", .data = &mpc_i2c_data_512x, },
 	{.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, },
 	{.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, },
 	{.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, },
@@ -648,5 +702,5 @@ module_exit(fsl_i2c_exit);
 
 MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
 MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
-		   "MPC824x/85xx/52xx processors");
+		   "MPC824x/85xx/512x/52xx processors");
 MODULE_LICENSE("GPL");
-- 
1.6.2.5

[PATCH 3/3] powerpc: doc/dts-bindings: update doc of FSL I2C bindings

[Wolfgang Grandegger]

From: Wolfgang Grandegger <wg@denx.de>

This patch adds the MPC5121 to the list of supported devices,
enhances the doc of the "clock-frequency" property and removes
the obsolete "cell-index" property from the example nodes.

Signed-off-by: Wolfgang Grandegger <wg@denx.de>
---
 Documentation/powerpc/dts-bindings/fsl/i2c.txt |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/powerpc/dts-bindings/fsl/i2c.txt b/Documentation/powerpc/dts-bindings/fsl/i2c.txt
index b6d2e21..2af8a05 100644
--- a/Documentation/powerpc/dts-bindings/fsl/i2c.txt
+++ b/Documentation/powerpc/dts-bindings/fsl/i2c.txt
@@ -9,8 +9,8 @@ Recommended properties :
 
  - compatible : compatibility list with 2 entries, the first should
    be "fsl,CHIP-i2c" where CHIP is the name of a compatible processor,
-   e.g. mpc8313, mpc8543, mpc8544, mpc5200 or mpc5200b. The second one
-   should be "fsl-i2c".
+   e.g. mpc8313, mpc8543, mpc8544, mpc5121, mpc5200 or mpc5200b. The
+   second one should be "fsl-i2c".
  - interrupts : <a b> where a is the interrupt number and b is a
    field that represents an encoding of the sense and level
    information for the interrupt.  This should be encoded based on
@@ -20,7 +20,9 @@ Recommended properties :
    services interrupts for this device.
  - fsl,preserve-clocking : boolean; if defined, the clock settings
    from the bootloader are preserved (not touched).
- - clock-frequency : desired I2C bus clock frequency in Hz.
+ - clock-frequency : desired I2C bus clock frequency in Hz.  If this
+   property and "fsl,preserve-clocking" is not defined, a safe fixed
+   clock divider value is used (resulting in a small clock frequency).
 
 Examples :
 
@@ -28,7 +30,6 @@ Examples :
 		#address-cells = <1>;
 		#size-cells = <0>;
 		compatible = "fsl,mpc5200b-i2c","fsl,mpc5200-i2c","fsl-i2c";
-		cell-index = <0>;
 		reg = <0x3d00 0x40>;
 		interrupts = <2 15 0>;
 		interrupt-parent = <&mpc5200_pic>;
@@ -38,7 +39,6 @@ Examples :
 	i2c@3100 {
 		#address-cells = <1>;
 		#size-cells = <0>;
-		cell-index = <1>;
 		compatible = "fsl,mpc8544-i2c", "fsl-i2c";
 		reg = <0x3100 0x100>;
 		interrupts = <43 2>;
-- 
1.6.2.5

Re: [PATCH 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

[Wolfram Sang]

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Hi Wolfgang,

On Mon, Jan 25, 2010 at 09:27:08AM +0100, Wolfgang Grandegger wrote:
> From: Wolfgang Grandegger <wg@denx.de>
> 
> The "setclock" initialization functions have been renamed to "setup"
> because I2C interrupts must be enabled for the MPC512x. This requires
> to handle "fsl,preserve-clocking" in a slighly different way. Also,
> the old settings are now reported calling dev_dbg(). For the MPC512x
> the clock setup function of the MPC52xx can be re-used.
> 
> Signed-off-by: Wolfgang Grandegger <wg@denx.de>
> ---
>  drivers/i2c/busses/Kconfig   |    9 ++--
>  drivers/i2c/busses/i2c-mpc.c |  122 ++++++++++++++++++++++++++++++------------
>  2 files changed, 93 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 5f318ce..f481f30 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -418,13 +418,14 @@ config I2C_IXP2000
>  	  instead.
>  
>  config I2C_MPC
> -	tristate "MPC107/824x/85xx/52xx/86xx"
> +	tristate "MPC107/824x/85xx/512x/52xx/86xx"
>  	depends on PPC32
>  	help
>  	  If you say yes to this option, support will be included for the
> -	  built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245 and
> -	  MPC85xx/MPC8641 family processors. The driver may also work on 52xx
> -	  family processors, though interrupts are known not to work.
> +	  built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245,
> +	  MPC85xx/MPC8641 and MPC512x family processors. The driver may
> +	  also work on 52xx family processors, though interrupts are known
> +	  not to work.

Opinion poll: Can we remove the "may work" sentence while we are here? It has
worked fine for years. BTW, which interrupts are meant here (from I2C slaves?
interrupts of the controller?)?

>  
>  	  This driver can also be built as a module.  If so, the module
>  	  will be called i2c-mpc.
> diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
> index 2cb864e..70c3e5d 100644
> --- a/drivers/i2c/busses/i2c-mpc.c
> +++ b/drivers/i2c/busses/i2c-mpc.c
> @@ -67,9 +67,8 @@ struct mpc_i2c_divider {
>  };
>  
>  struct mpc_i2c_data {
> -	void (*setclock)(struct device_node *node,
> -			 struct mpc_i2c *i2c,
> -			 u32 clock, u32 prescaler);
> +	void (*setup)(struct device_node *node, struct mpc_i2c *i2c,
> +		      u32 clock, u32 prescaler);
>  	u32 prescaler;
>  };
>  
> @@ -164,7 +163,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
>  	return 0;
>  }
>  
> -#ifdef CONFIG_PPC_MPC52xx
> +#if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x)
>  static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
>  	{20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
>  	{28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
> @@ -216,12 +215,18 @@ static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
>  	return div ? (int)div->fdr : -EINVAL;
>  }
>  
> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
> -					    struct mpc_i2c *i2c,
> -					    u32 clock, u32 prescaler)
> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
>  {
>  	int ret, fdr;
>  
> +	if (clock == -1) {

Could we use 0 for 'no_clock'? This would make the above statement simply

	if (!clock)

and saves us using -1 with a u32.

> +		dev_dbg(i2c->dev, "using fdr %d\n",
> +			readb(i2c->base + MPC_I2C_FDR));
> +		return;	/* preserve clocking */
> +	}
> +
>  	ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
>  	fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
>  
> @@ -230,13 +235,50 @@ static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
>  	if (ret >= 0)
>  		dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
>  }
> -#else /* !CONFIG_PPC_MPC52xx */
> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
> -					    struct mpc_i2c *i2c,
> -					    u32 clock, u32 prescaler)
> +#else /* !(CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x) */
> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
> +{
> +}
> +#endif /* CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x */
> +
> +#ifdef CONFIG_PPC_MPC512x
> +static void __devinit mpc_i2c_setup_512x(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
> +{
> +	struct device_node *node_ctrl;
> +	void __iomem *ctrl;
> +	const u32 *pval;
> +	u32 idx;
> +
> +	/* Enable I2C interrupts for mpc5121 */
> +	node_ctrl = of_find_compatible_node(NULL, NULL,
> +					    "fsl,mpc5121-i2c-ctrl");
> +	if (node_ctrl) {
> +		ctrl = of_iomap(node_ctrl, 0);
> +		if (ctrl) {
> +
> +			/* Interrupt enable bits for i2c-0/1/2: bit 24/26/28 */
> +			pval = of_get_property(node, "reg", NULL);
> +			idx = (*pval & 0xff) / 0x20;
> +			setbits32(ctrl, 1 << (24 + idx * 2));
> +			iounmap(ctrl);
> +		}
> +		of_node_put(node_ctrl);
> +	}
> +
> +	/* The clock setup for the 52xx works also fine for the 512x */
> +	mpc_i2c_setup_52xx(node, i2c, clock, prescaler);
> +}
> +#else /* CONFIG_PPC_MPC512x */
> +static void __devinit mpc_i2c_setup_512x(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
>  {
>  }
> -#endif /* CONFIG_PPC_MPC52xx*/
> +#endif /* CONFIG_PPC_MPC512x */
>  
>  #ifdef CONFIG_FSL_SOC
>  static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
> @@ -322,12 +364,19 @@ static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
>  	return div ? (int)div->fdr : -EINVAL;
>  }
>  
> -static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
> -					    struct mpc_i2c *i2c,
> -					    u32 clock, u32 prescaler)
> +static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
>  {
>  	int ret, fdr;
>  
> +	if (clock == -1) {
> +		dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n",
> +			readb(i2c->base + MPC_I2C_DFSRR),
> +			readb(i2c->base + MPC_I2C_FDR));
> +		return;	/* preserve clocking */
> +	}
> +
>  	ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
>  	fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
>  
> @@ -340,9 +389,9 @@ static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
>  }
>  
>  #else /* !CONFIG_FSL_SOC */
> -static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
> -					    struct mpc_i2c *i2c,
> -					    u32 clock, u32 prescaler)
> +static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
> +					 struct mpc_i2c *i2c,
> +					 u32 clock, u32 prescaler)
>  {
>  }
>  #endif /* CONFIG_FSL_SOC */
> @@ -525,21 +574,21 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
>  		}
>  	}
>  
> -	if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
> +	if (of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
> +		clock = -1;
> +	} else {
>  		prop = of_get_property(op->node, "clock-frequency", &plen);
>  		if (prop && plen == sizeof(u32))
>  			clock = *prop;
> +	}
>  
> -		if (match->data) {
> -			struct mpc_i2c_data *data =
> -				(struct mpc_i2c_data *)match->data;
> -			data->setclock(op->node, i2c, clock, data->prescaler);
> -		} else {
> -			/* Backwards compatibility */
> -			if (of_get_property(op->node, "dfsrr", NULL))
> -				mpc_i2c_setclock_8xxx(op->node, i2c,
> -						      clock, 0);
> -		}
> +	if (match->data) {
> +		struct mpc_i2c_data *data = (struct mpc_i2c_data *)match->data;

The cast should not be necessary.

> +		data->setup(op->node, i2c, clock, data->prescaler);
> +	} else {
> +		/* Backwards compatibility */
> +		if (of_get_property(op->node, "dfsrr", NULL))
> +			mpc_i2c_setup_8xxx(op->node, i2c, clock, 0);
>  	}
>  
>  	dev_set_drvdata(&op->dev, i2c);
> @@ -585,20 +634,24 @@ static int __devexit fsl_i2c_remove(struct of_device *op)
>  };
>  
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_52xx = {
> -	.setclock = mpc_i2c_setclock_52xx,
> +	.setup = mpc_i2c_setup_52xx,
> +};
> +
> +static struct mpc_i2c_data __devinitdata mpc_i2c_data_512x = {
> +	.setup = mpc_i2c_setup_512x,
>  };
>  
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8313 = {
> -	.setclock = mpc_i2c_setclock_8xxx,
> +	.setup = mpc_i2c_setup_8xxx,
>  };
>  
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8543 = {
> -	.setclock = mpc_i2c_setclock_8xxx,
> +	.setup = mpc_i2c_setup_8xxx,
>  	.prescaler = 2,
>  };
>  
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8544 = {
> -	.setclock = mpc_i2c_setclock_8xxx,
> +	.setup = mpc_i2c_setup_8xxx,
>  	.prescaler = 3,
>  };
>  
> @@ -606,6 +659,7 @@ static const struct of_device_id mpc_i2c_of_match[] = {
>  	{.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
>  	{.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, },
>  	{.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
> +	{.compatible = "fsl,mpc5121-i2c", .data = &mpc_i2c_data_512x, },
>  	{.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, },
>  	{.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, },
>  	{.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, },
> @@ -648,5 +702,5 @@ module_exit(fsl_i2c_exit);
>  
>  MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
>  MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
> -		   "MPC824x/85xx/52xx processors");
> +		   "MPC824x/85xx/512x/52xx processors");
>  MODULE_LICENSE("GPL");
> -- 
> 1.6.2.5
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: [PATCH 3/3] powerpc: doc/dts-bindings: update doc of FSL I2C bindings

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 2854 bytes --]

On Mon, Jan 25, 2010 at 09:27:09AM +0100, Wolfgang Grandegger wrote:
> From: Wolfgang Grandegger <wg@denx.de>
> 
> This patch adds the MPC5121 to the list of supported devices,
> enhances the doc of the "clock-frequency" property and removes
> the obsolete "cell-index" property from the example nodes.

I think "fsl,mpc5121-i2c-ctrl" needs to be documented here, too?

> 
> Signed-off-by: Wolfgang Grandegger <wg@denx.de>
> ---
>  Documentation/powerpc/dts-bindings/fsl/i2c.txt |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/powerpc/dts-bindings/fsl/i2c.txt b/Documentation/powerpc/dts-bindings/fsl/i2c.txt
> index b6d2e21..2af8a05 100644
> --- a/Documentation/powerpc/dts-bindings/fsl/i2c.txt
> +++ b/Documentation/powerpc/dts-bindings/fsl/i2c.txt
> @@ -9,8 +9,8 @@ Recommended properties :
>  
>   - compatible : compatibility list with 2 entries, the first should
>     be "fsl,CHIP-i2c" where CHIP is the name of a compatible processor,
> -   e.g. mpc8313, mpc8543, mpc8544, mpc5200 or mpc5200b. The second one
> -   should be "fsl-i2c".
> +   e.g. mpc8313, mpc8543, mpc8544, mpc5121, mpc5200 or mpc5200b. The
> +   second one should be "fsl-i2c".
>   - interrupts : <a b> where a is the interrupt number and b is a
>     field that represents an encoding of the sense and level
>     information for the interrupt.  This should be encoded based on
> @@ -20,7 +20,9 @@ Recommended properties :
>     services interrupts for this device.
>   - fsl,preserve-clocking : boolean; if defined, the clock settings
>     from the bootloader are preserved (not touched).
> - - clock-frequency : desired I2C bus clock frequency in Hz.
> + - clock-frequency : desired I2C bus clock frequency in Hz.  If this
> +   property and "fsl,preserve-clocking" is not defined, a safe fixed
> +   clock divider value is used (resulting in a small clock frequency).
>  
>  Examples :
>  
> @@ -28,7 +30,6 @@ Examples :
>  		#address-cells = <1>;
>  		#size-cells = <0>;
>  		compatible = "fsl,mpc5200b-i2c","fsl,mpc5200-i2c","fsl-i2c";
> -		cell-index = <0>;
>  		reg = <0x3d00 0x40>;
>  		interrupts = <2 15 0>;
>  		interrupt-parent = <&mpc5200_pic>;
> @@ -38,7 +39,6 @@ Examples :
>  	i2c@3100 {
>  		#address-cells = <1>;
>  		#size-cells = <0>;
> -		cell-index = <1>;
>  		compatible = "fsl,mpc8544-i2c", "fsl-i2c";
>  		reg = <0x3100 0x100>;
>  		interrupts = <43 2>;
> -- 
> 1.6.2.5
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: [PATCH 3/3] powerpc: doc/dts-bindings: update doc of FSL I2C bindings

[Wolfgang Grandegger]

Wolfram Sang wrote:
> On Mon, Jan 25, 2010 at 09:27:09AM +0100, Wolfgang Grandegger wrote:
>> From: Wolfgang Grandegger <wg@denx.de>
>>
>> This patch adds the MPC5121 to the list of supported devices,
>> enhances the doc of the "clock-frequency" property and removes
>> the obsolete "cell-index" property from the example nodes.
> 
> I think "fsl,mpc5121-i2c-ctrl" needs to be documented here, too?

Yep,

Wolfgang.

Re: [PATCH 0/3] i2c-mpc: add support for the Freescale MPC512x and other fixes

[Wolfram Sang]

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On Mon, Jan 25, 2010 at 09:27:06AM +0100, Wolfgang Grandegger wrote:

> This patch series adds support for the MPC512x from Freescale to the
> i2c-mpc driver. At that occasion, issues with  __devinit[data] have
> been fixed and the doc of the FSL I2C dts bindings updated. It has
> been tested on a MPC5121ADS, TQM5200 and TQM8560 board

Nice :) BTW, is there a git-tree meanwhile for your or Anatolij's
MPC5121-development?

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: [PATCH 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

[Wolfgang Grandegger]

Hi Wolfram,

Wolfram Sang wrote:
> Hi Wolfgang,
> 
> On Mon, Jan 25, 2010 at 09:27:08AM +0100, Wolfgang Grandegger wrote:
>> From: Wolfgang Grandegger <wg@denx.de>
>>
>> The "setclock" initialization functions have been renamed to "setup"
>> because I2C interrupts must be enabled for the MPC512x. This requires
>> to handle "fsl,preserve-clocking" in a slighly different way. Also,
>> the old settings are now reported calling dev_dbg(). For the MPC512x
>> the clock setup function of the MPC52xx can be re-used.
>>
>> Signed-off-by: Wolfgang Grandegger <wg@denx.de>
>> ---
>>  drivers/i2c/busses/Kconfig   |    9 ++--
>>  drivers/i2c/busses/i2c-mpc.c |  122 ++++++++++++++++++++++++++++++------------
>>  2 files changed, 93 insertions(+), 38 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>> index 5f318ce..f481f30 100644
>> --- a/drivers/i2c/busses/Kconfig
>> +++ b/drivers/i2c/busses/Kconfig
>> @@ -418,13 +418,14 @@ config I2C_IXP2000
>>  	  instead.
>>  
>>  config I2C_MPC
>> -	tristate "MPC107/824x/85xx/52xx/86xx"
>> +	tristate "MPC107/824x/85xx/512x/52xx/86xx"
>>  	depends on PPC32
>>  	help
>>  	  If you say yes to this option, support will be included for the
>> -	  built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245 and
>> -	  MPC85xx/MPC8641 family processors. The driver may also work on 52xx
>> -	  family processors, though interrupts are known not to work.
>> +	  built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245,
>> +	  MPC85xx/MPC8641 and MPC512x family processors. The driver may
>> +	  also work on 52xx family processors, though interrupts are known
>> +	  not to work.
> 
> Opinion poll: Can we remove the "may work" sentence while we are here? It has
> worked fine for years. BTW, which interrupts are meant here (from I2C slaves?
> interrupts of the controller?)?

I first wanted to remove this sentence but as I was not sure what it's
exact meaning... Anyway, it's confusing and I would remove it.

>>  	  This driver can also be built as a module.  If so, the module
>>  	  will be called i2c-mpc.
>> diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
>> index 2cb864e..70c3e5d 100644
>> --- a/drivers/i2c/busses/i2c-mpc.c
>> +++ b/drivers/i2c/busses/i2c-mpc.c
>> @@ -67,9 +67,8 @@ struct mpc_i2c_divider {
>>  };
>>  
>>  struct mpc_i2c_data {
>> -	void (*setclock)(struct device_node *node,
>> -			 struct mpc_i2c *i2c,
>> -			 u32 clock, u32 prescaler);
>> +	void (*setup)(struct device_node *node, struct mpc_i2c *i2c,
>> +		      u32 clock, u32 prescaler);
>>  	u32 prescaler;
>>  };
>>  
>> @@ -164,7 +163,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
>>  	return 0;
>>  }
>>  
>> -#ifdef CONFIG_PPC_MPC52xx
>> +#if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x)
>>  static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
>>  	{20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
>>  	{28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
>> @@ -216,12 +215,18 @@ static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
>>  	return div ? (int)div->fdr : -EINVAL;
>>  }
>>  
>> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
>> -					    struct mpc_i2c *i2c,
>> -					    u32 clock, u32 prescaler)
>> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
>> +					 struct mpc_i2c *i2c,
>> +					 u32 clock, u32 prescaler)
>>  {
>>  	int ret, fdr;
>>  
>> +	if (clock == -1) {
> 
> Could we use 0 for 'no_clock'? This would make the above statement simply

"0" is already used to maintain backward compatibility setting a safe
divider.

> 	if (!clock)
> 
> and saves us using -1 with a u32.
> 
>> +		dev_dbg(i2c->dev, "using fdr %d\n",
>> +			readb(i2c->base + MPC_I2C_FDR));
>> +		return;	/* preserve clocking */
>> +	}
>> +
>>  	ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
>>  	fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
>>  
>> @@ -230,13 +235,50 @@ static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
>>  	if (ret >= 0)
>>  		dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
>>  }
>> -#else /* !CONFIG_PPC_MPC52xx */
>> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
>> -					    struct mpc_i2c *i2c,
>> -					    u32 clock, u32 prescaler)
>> +#else /* !(CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x) */
>> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
>> +					 struct mpc_i2c *i2c,
>> +					 u32 clock, u32 prescaler)
>> +{
>> +}
>> +#endif /* CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x */
>> +
>> +#ifdef CONFIG_PPC_MPC512x
>> +static void __devinit mpc_i2c_setup_512x(struct device_node *node,
>> +					 struct mpc_i2c *i2c,
>> +					 u32 clock, u32 prescaler)
>> +{
>> +	struct device_node *node_ctrl;
>> +	void __iomem *ctrl;
>> +	const u32 *pval;
>> +	u32 idx;
>> +
>> +	/* Enable I2C interrupts for mpc5121 */
>> +	node_ctrl = of_find_compatible_node(NULL, NULL,
>> +					    "fsl,mpc5121-i2c-ctrl");
>> +	if (node_ctrl) {
>> +		ctrl = of_iomap(node_ctrl, 0);
>> +		if (ctrl) {
>> +
>> +			/* Interrupt enable bits for i2c-0/1/2: bit 24/26/28 */
>> +			pval = of_get_property(node, "reg", NULL);
>> +			idx = (*pval & 0xff) / 0x20;
>> +			setbits32(ctrl, 1 << (24 + idx * 2));
>> +			iounmap(ctrl);
>> +		}
>> +		of_node_put(node_ctrl);
>> +	}
>> +
>> +	/* The clock setup for the 52xx works also fine for the 512x */
>> +	mpc_i2c_setup_52xx(node, i2c, clock, prescaler);
>> +}
>> +#else /* CONFIG_PPC_MPC512x */
>> +static void __devinit mpc_i2c_setup_512x(struct device_node *node,
>> +					 struct mpc_i2c *i2c,
>> +					 u32 clock, u32 prescaler)
>>  {
>>  }
>> -#endif /* CONFIG_PPC_MPC52xx*/
>> +#endif /* CONFIG_PPC_MPC512x */
>>  
>>  #ifdef CONFIG_FSL_SOC
>>  static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
>> @@ -322,12 +364,19 @@ static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
>>  	return div ? (int)div->fdr : -EINVAL;
>>  }
>>  
>> -static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
>> -					    struct mpc_i2c *i2c,
>> -					    u32 clock, u32 prescaler)
>> +static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
>> +					 struct mpc_i2c *i2c,
>> +					 u32 clock, u32 prescaler)
>>  {
>>  	int ret, fdr;
>>  
>> +	if (clock == -1) {
>> +		dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n",
>> +			readb(i2c->base + MPC_I2C_DFSRR),
>> +			readb(i2c->base + MPC_I2C_FDR));
>> +		return;	/* preserve clocking */
>> +	}
>> +
>>  	ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
>>  	fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
>>  
>> @@ -340,9 +389,9 @@ static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
>>  }
>>  
>>  #else /* !CONFIG_FSL_SOC */
>> -static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
>> -					    struct mpc_i2c *i2c,
>> -					    u32 clock, u32 prescaler)
>> +static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
>> +					 struct mpc_i2c *i2c,
>> +					 u32 clock, u32 prescaler)
>>  {
>>  }
>>  #endif /* CONFIG_FSL_SOC */
>> @@ -525,21 +574,21 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
>>  		}
>>  	}
>>  
>> -	if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
>> +	if (of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
>> +		clock = -1;
>> +	} else {
>>  		prop = of_get_property(op->node, "clock-frequency", &plen);
>>  		if (prop && plen == sizeof(u32))
>>  			clock = *prop;
>> +	}
>>  
>> -		if (match->data) {
>> -			struct mpc_i2c_data *data =
>> -				(struct mpc_i2c_data *)match->data;
>> -			data->setclock(op->node, i2c, clock, data->prescaler);
>> -		} else {
>> -			/* Backwards compatibility */
>> -			if (of_get_property(op->node, "dfsrr", NULL))
>> -				mpc_i2c_setclock_8xxx(op->node, i2c,
>> -						      clock, 0);
>> -		}
>> +	if (match->data) {
>> +		struct mpc_i2c_data *data = (struct mpc_i2c_data *)match->data;
> 
> The cast should not be necessary.

Right.

Wolfgang.

Re: [PATCH 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

[Wolfram Sang]

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> >>  
> >> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
> >> -					    struct mpc_i2c *i2c,
> >> -					    u32 clock, u32 prescaler)
> >> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
> >> +					 struct mpc_i2c *i2c,
> >> +					 u32 clock, u32 prescaler)
> >>  {
> >>  	int ret, fdr;
> >>  
> >> +	if (clock == -1) {
> > 
> > Could we use 0 for 'no_clock'? This would make the above statement simply
> 
> "0" is already used to maintain backward compatibility setting a safe
> divider.

Ah, now I see:

'clock == -1' means 'preserve clocks' (and is checked here in mpc_i2c_setup_52xx())
'clock ==  0' means 'safe divider' (and is checked in mpc_i2c_get_fdr_52xx())

This is not a beauty ;)

What about adding a flags variable to the setup-functions?

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: [PATCH 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

[Wolfgang Grandegger]

Wolfram Sang wrote:
>>>>  
>>>> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
>>>> -					    struct mpc_i2c *i2c,
>>>> -					    u32 clock, u32 prescaler)
>>>> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
>>>> +					 struct mpc_i2c *i2c,
>>>> +					 u32 clock, u32 prescaler)
>>>>  {
>>>>  	int ret, fdr;
>>>>  
>>>> +	if (clock == -1) {
>>> Could we use 0 for 'no_clock'? This would make the above statement simply
>> "0" is already used to maintain backward compatibility setting a safe
>> divider.
> 
> Ah, now I see:
> 
> 'clock == -1' means 'preserve clocks' (and is checked here in mpc_i2c_setup_52xx())

Yes, this is now necessary because "setup" does not just do clock settings.

> 'clock ==  0' means 'safe divider' (and is checked in mpc_i2c_get_fdr_52xx())

This is for compatibility with old DTS files and last time it was tricky
 to get that right and therefore...

> This is not a beauty ;)
> 
> What about adding a flags variable to the setup-functions?

.. I hesitate to make bigger changes to the code flow, which the
introduction of a flags variable would required. Also it seems to be
overkill to me. I will have a closer look, though. At a minimum I will
replace "-1" with "MPC_I2C_PRESERVE_CLOCK".

Wolfgang.

Re: [PATCH 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

[Wolfram Sang]

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> overkill to me. I will have a closer look, though. At a minimum I will
> replace "-1" with "MPC_I2C_PRESERVE_CLOCK".

Might be also an idea to define it with ~0 (clock is still unsigned). If
possible, the code checking for those two cases (0 and "-1") should be close
together. That could be a compromise until more quirks are needed ;)

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: [PATCH 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

[Wolfgang Grandegger]

Wolfram Sang wrote:
>> overkill to me. I will have a closer look, though. At a minimum I will
>> replace "-1" with "MPC_I2C_PRESERVE_CLOCK".
> 
> Might be also an idea to define it with ~0 (clock is still unsigned). If
> possible, the code checking for those two cases (0 and "-1") should be close
> together. That could be a compromise until more quirks are needed ;)

I just sent v2. Hope it's OK now.

Wolfgang.

Re: [PATCH 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

[Wolfram Sang]

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> I just sent v2. Hope it's OK now.

Thanks, will check tomorrow.

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: [PATCH 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

[Ben Dooks]

On Mon, Jan 25, 2010 at 04:15:09PM +0100, Wolfram Sang wrote:
> > >>  
> > >> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
> > >> -					    struct mpc_i2c *i2c,
> > >> -					    u32 clock, u32 prescaler)
> > >> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
> > >> +					 struct mpc_i2c *i2c,
> > >> +					 u32 clock, u32 prescaler)
> > >>  {
> > >>  	int ret, fdr;
> > >>  
> > >> +	if (clock == -1) {
> > > 
> > > Could we use 0 for 'no_clock'? This would make the above statement simply
> > 
> > "0" is already used to maintain backward compatibility setting a safe
> > divider.
> 
> Ah, now I see:
> 
> 'clock == -1' means 'preserve clocks' (and is checked here in mpc_i2c_setup_52xx())
> 'clock ==  0' means 'safe divider' (and is checked in mpc_i2c_get_fdr_52xx())

hmm, sounds like a job for a  #define or similar.
 
> This is not a beauty ;)
> 
> What about adding a flags variable to the setup-functions?
> 
> Regards,
> 
>    Wolfram
> 
> -- 
> Pengutronix e.K.                           | Wolfram Sang                |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |



-- 
Ben (ben@fluff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'

Re: [PATCH 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

[Wolfgang Grandegger]

Ben Dooks wrote:
> On Mon, Jan 25, 2010 at 04:15:09PM +0100, Wolfram Sang wrote:
>>>>>  
>>>>> -static void __devinit mpc_i2c_setclock_52xx(struct device_node *node,
>>>>> -					    struct mpc_i2c *i2c,
>>>>> -					    u32 clock, u32 prescaler)
>>>>> +static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
>>>>> +					 struct mpc_i2c *i2c,
>>>>> +					 u32 clock, u32 prescaler)
>>>>>  {
>>>>>  	int ret, fdr;
>>>>>  
>>>>> +	if (clock == -1) {
>>>> Could we use 0 for 'no_clock'? This would make the above statement simply
>>> "0" is already used to maintain backward compatibility setting a safe
>>> divider.
>> Ah, now I see:
>>
>> 'clock == -1' means 'preserve clocks' (and is checked here in mpc_i2c_setup_52xx())
>> 'clock ==  0' means 'safe divider' (and is checked in mpc_i2c_get_fdr_52xx())
> 
> hmm, sounds like a job for a  #define or similar.

See v2 of this patch.

Wolfgang.